run-scripts.sh

#!/bin/bash
# 1. Save this script somewhere

# 2. Change the following variable, adding the correct path and file extension
#    for the files you want to handle.
files="directory/*.extension"

for f in $files; do
  echo "Executing commands for file: $f ...";
  # 3a. Add Command 1
  #  b. Add Command 2
  #  c. Add Command 3
done

#    For the next step you may find yourself in a vim editor, which can be confusing. If you'd rather use TextMate for example, run the following before step 4:
#    ln -s mate ~/bin/mate_wait
#    export VISUAL='mate_wait'

# 4. Then type `crontab -e``and add a line similar to the following.
#    1 2 3 4 5 /path/to/run-scripts.sh
#
#    See http://www.cyberciti.biz/faq/how-do-i-add-jobs-to-cron-under-linux-or-unix-oses/
#    for an explanation of how to specify the frequency.